Take for example the following scenarios:

Lets say I was searching for information about :

(1) A Game Review – lets say fallout 3 (just for example).

If I search Google: I get results mentioning sites that have THE ACTUAL GAME REVIEW.

If I search twitter I get comments from people who have READ THE GAME REVIEW.

(2) If I was a developer looking for a site containing technical questions and answers:

If I search Google – I get links (ranked by relevance) to sites that contain questions and answers for technical developers.

If I search Twitter, I get user comments on sites that contain questions ans answers for technical developers.

Twitter can never replace Google as a primary search result because Google uses an automated system for indexing the web.

Users however are selective about what they discuss.

For Twitter to be effective as a 1 stop internet index, it would mean that twitter users would need to tweet about everything, and in great quality and consistency.

Twitter is something else all together, it might be good for certain things like finding out what is the general opinion on a topic, but because people are free to tweet about what they want, without following any format templates, or without even being knowledgeable or truthful. Twitter results are somewhat misleading.

Google can index tweets, but thankfully it knows to “take tweets with a pinch of salt”.

Imagine searching for products, and information and having to sift through 1000′s of mindless tweets before you found the link to the actual product. No thanks!